2" ASA 0,73x Reducer and Coma Corrector

For astro imaging I use a 300mm F/5 Newton telescope which is equipped with a hyperbolic main mirror. These scopes deliver good images with smaller CCD camera's but when DSLR's or bigger CCD camera's are used coma will pop up in the corners of the image. In order to cope with this in combination with reducing the focal length I purchased the 2" ASA 0,73x Newton Reducer/Corrector. Key is that these correctors are placed at a precise distance from the imaging plane (CMOS or CCD). This distance is 65mm. Find below a test image of M81/82 made with the 300mm Newton, ASA corrector and a QYH10 CCD camera with a Hutech Idas-v4 filter. When you click on the marked corners you will get an full resolution image of the corresponding corners. The results show that the ASA Newton corrector works very well for this kind of telescopes.

© Copyright Rob Kantelberg
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